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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1fba32e06f4f8d2537e3401d91d6859ad64af0e8a5e8ad7c40c5b5798c8c47' 
  AND token = '90IwOQeToOILTlkN+xC7ka+60fq4ajOR1BoIVhbbA2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}